All categories

3 years ago

Easy Question! Chemistry - Please help! I give thanks - It's the picture - Question 2

Chemistry

1 answer:

Katena32 [7]3 years ago

7 0

Volume of a cylinder = $\pi r^{2} h$
r = $\frac{D}{2}$
  = $\frac{8.4cm}{2}$
  = 4.2cm

h = 14.5cm
$\pi$ = 3.14

V= (3.14) * ( $(4.2cm)^{2}$ )*  14.5cm
= 803.1 $cm^{3}$

You might be interested in

The graph shows the solubility of several different salts in water, across a range of temperatures. According to the

sladkih [1.3K]

Answer:

Sodium chloride

See the graph attached

Explanation:

The attached graph with a green and a red arrow facilitates the understanding of this explanation.

To read the solubility on the graph, you can start with the temperature, on the x-axis.

The red vertical arrow shows how, departing from the 40ºC temperature on the x-axis, you intersect the solutibility curve of sodium chloride at a height (y-axis) corresponding to 60 g/100cm³ of water (follow the green horizontal arrow).

Hence, sodium chloride is the salt that can dissolve at a concentration of about 60g/100cm³ of water at 40ºC.

4 0

3 years ago

Read 2 more answers

How much heat is required to change the temperature of two cups of water (500 g) from room temperature (25◦C) to boiling? Specif

NNADVOKAT [17]

Answer:

c. 157 KJ

Explanation:

Q= mC dT dT= 100°C(boiling point) - 25°C=75°C

Q= (500 g * 4.184 J/g °C * 75 °C)

Q= 156900 J= 157 KJ

6 0

3 years ago

What are the half-reactions for a galvanic cell with Zn and Mg electrodes?

Alona [7]

the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

<h3 /><h3>Further explanation</h3>

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

7 0

3 years ago

What is a proton?

Scrat [10]

Answer:

the positively charged particle found in atomic nuclel

Explanation:

protons carry positive charge and attracts negatively charged particles called electron

3 0

3 years ago

In Part A, you found the number of moles of product (1.80 mol P2O5 ) formed from the given amount of phosphorus and excess oxyge

Shtirlitz [24]

AAAAAAAHAHAHAHAHAHHAHAHAHA

5 0

2 years ago